Radical

An ultra-Liberal, verging on republican opinions. The term was
first applied as a party name in 1818 to Henry Hunt, Major Cartwright,
and others of the same clique, who wished to introduce radical
reform in the representative system, and not merely to disfranchise
and enfranchise a borough or two. Lord Bolingbroke, in his Discourses on Parties, says, “Such a remedy might have wrought a radical cure of the evil that threatens our constitution.”